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Defined in header `<functional>`

template< class T > struct logical_not;

Function object for performing logical NOT (logical negation). Effectively calls operator! for type T.

std::logical_not::operator()


bool operator()( const T& arg ) const;

Returns the logical NOT of arg.

arg

-

value to compute logical NOT of

The result of !arg.

(none)

bool operator()(const T &arg) const 
{
    return !arg;
}

std::logical_not


operator()	returns the logical NOT of the argument (public member function)